vig ‧ i ‧ lant /ˈvɪdʒələnt, ˈvɪdʒɪlənt/ BrE AmE adjective
[ Date: 1400-1500 ; Language: Latin ; Origin: present participle of vigilare 'to stay awake, keep watch' , from vigil ; ⇨ ↑ vigil ]
giving careful attention to what is happening, so that you will notice any danger or illegal activity:
Please remain vigilant at all times and report anything suspicious.
—vigilantly adverb
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In everyday English, people usually use the expression watch out rather than be vigilant :
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We were told to watch out for anything suspicious.